Fitbit has multiple daily goals that you can set. These goals are represented on fitbit.com, the mobile apps, and on the device. If you want to change what the goal value is, you can do this on fitbit.com by hovering over the dashboard tile and clicking on the gear icon in the lower left.
post- A prefix that means after, as in postoperative, after an operation, or behind, as in postnasal, behind the nose or nasal passages.
mail system, c.1500, riders and horses posted at intervals, from post (n.2) on notion of riders and horses posted at intervals along a route to speed mail in relays, probably formed on model of Middle French poste in this sense (late 15c.). Meaning system for carrying mail is from 1660s.